It has been my experience if you have the barrel nut backed away from the lug at least 1/4th of a turn the action will unscrew. You are either turning the action the wrong way or you left the scope mount on and you have the front screw tightened into the threads. If that is the case the threads are damaged and you need to tread lightly.

If you have nearly stripped the teeth off of the wrench your nut is probably crap. At this point you should realize that you should not be working on a gun without supervision of an experienced mechanically inclined individual. Im not trying to hurt your feelings but the next thing you will want to do is stick something in the actions loading/ejection port and twist on the action. At that point the trash can will be all that is left for your twisted piece of junk.

I'm sorry for being harsh but dang man....I hope your kidding. Take some pictures and post them, then describe the problem.